body,h2{padding: 0;
margin: 0;}
#a{width: 1200px;
margin: 0 auto;}
#a-a{width: 400px;
margin: 0 auto;}
#a-a h2{border-bottom: 2px solid  black;
text-align: center;
margin-top: 50px;}
#a-b{margin-top: 10px;}
#a-b span{font-size: 15px;
padding-top: 30px;}
#a-b span:nth-child(1){margin-left: 400px;
}
.left{padding-left: 50px;}
#a-b-a{margin-left: 300px;}
#biaodan{width: 1000px;
margin: 0 auto; 
 border: 1px solid black;}
    #biaodan #biaodan1{border-spacing: 0px;
    border-collapse: collapse;
    text-align: center;}
#biaodan1 tr th{
    height: 35px;
    border: 1px solid black;
}
#biaodan1 tr th:nth-child(1){
    width: 280px;
}
#biaodan1 tr th:nth-child(2),th:nth-child(3){
    width: 150px;
 
}
#biaodan1 tr th:nth-child(4){width: 200px;
}
#biaodan1 tr th:nth-child(5){width: 230px;
}
#biaodan1 tr td{border: 1px solid black;
height: 35px;}

 /*#biaodan #biaodan1 tbody #last td:nth-child(2){
    width: 200px;
}

#biaodan1 #last td:nth-child(3){
    width: 200px;
}

#biaodan1 #last td:nth-child(4){
    width: 200px;
}

#biaodan1 #last td:nth-child(4){
    width: 200px;
}

#biaodan1 #last td:nth-child(5){
    width: 200px;
}

#biaodan1 #last td:nth-child(6){
    width: 200px;*/
#bbb #aa{width: 120px;}